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3, 4, 7, 12, 13, 18, 21, 22, 25, 30, 33, 34, 39, 40, 43, 48, 49, 54, 57, 58, 63, 64, 67, 72, 75, 76, 79, 84, 85, 90, 93, 94, 97, 102, 105, 106, 111, 112, 115, 120, 123, 124, 127, 132, 133, 138, 141, 142, 147, 148, 151, 156, 157, 162, 165, 166, 169, 174, 177
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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The number d(n) = n - a(n) is in {0, 2} for n >= 1.
Specifically, d(n) = 0 if n is in A025147; d(n) = 2 if n is in A181155.
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LINKS
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MATHEMATICA
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s = {0, 0}; w[0] = StringJoin[Map[ToString, s]];
w[n_] := StringReplace[w[n - 1], {"00" -> "001", "1" -> "100"}]
Table[w[n], {n, 0, 8}]
st = ToCharacterCode[w[11]] - 48 (* A286063 *)
Flatten[Position[st, 0]] (* A286727 *)
Flatten[Position[st, 1]] (* A286728 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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